Katahiza-Dachi 片膝立ち

The width and length of this stance is almost like Moto Dachi. In some positions in different katas, back leg knee may touch the floor also back leg and knee may get closer to the front leg. The photo below is part of Chatan Yara Kusanku right after Gedan Otoshi Gamae where the right hand is executing Yoko Uchi Uke.